Well, after a flurry of fixes and testing, with contributions from moritz++, diakopter++ and tadzik++, it landed today. We got to the point where the spectests showed up zero regressions, which was a very encouraging sign. Then, tadzik++ did a run of Ementaler (automatic building and testing of all the modules) to see how module ecosystem had fared the transition. That caught one issue, which was easily fixed. After that…no regressions there either. And not only did we not regress on any spectests, but the improved LTM meant some previously failing spectests are now passing also.

So, it’s merged. NQP is now bootstrapped using a regex implementation written in itself, Rakudo now uses QRegex for parsing, and the next release will ship with it. And there’s still a good three weeks to go until the next release to tune it – and, of course, for plenty more general Rakudo development.